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28.4.1 COM Callable Wrapper
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28.4.1 COM Callable Wrapper
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2006-10-13 14:41:00
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<div style='float:left;width:49%'>·<a href='100165726.htm'>28.3.5 在Windows窗体中使用ActiveX控件</a></div><div style='float:right;width:49%'>·<a href='100165727.htm'>28.3.6 在ASP.NET中使用COM对象</a></div><div style='float:left;width:49%'>·<a href='100165728.htm'>28.4 在COM客户程序中使用.NET组件</a></div><div style='float:right;width:49%'>·<a href='100165730.htm'>28.4.2 创建.NET组件</a></div><div style='float:left;width:49%'>·<a href='100165731.htm'>28.4.3 创建类型库</a></div><div style='float:right;width:49%'>·<a href='100165732.htm'>28.4.4 COM互操作特性</a></div></div>
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<div id="text"> <link href="css.css" rel="stylesheet" type="text/css" /><h3 style='margin-top:8.15pt;margin-right:0cm;FTEL:8.15pt;margin-left:
0cm'><span lang=EN-US>28.4.1 COM Callable Wrapper</span></h3>
<p class=MsoNormal><span style='font-family:宋体'>如果要使用</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>客户程序访问</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>组件，就必须使用</span><span lang=EN-US>RCW</span><span
style='font-family:宋体'>。要在</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>客户程序中访问</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>组件，就必须使用</span><span lang=EN-US>COM Callable
Wrapper(CCW)</span><span style='font-family:宋体'>。图</span><span lang=EN-US>28-13</span><span
style='font-family:宋体'>显示了封装了</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>类的</span><span lang=EN-US>CCW</span><span
style='font-family:宋体'>，提供了</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>客户程序希望使用的</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>接口。</span><span lang=EN-US>CCW</span><span
style='font-family:宋体'>提供了</span><span lang=EN-US>IUnknown</span><span
style='font-family:宋体'>、</span><span lang=EN-US>IDispatch</span><span
style='font-family:宋体'>、</span><span lang=EN-US>ISupportErrorInfo</span><span
style='font-family:宋体'>及其他接口，它还为事件提供了接口</span><span lang=EN-US>IConnectionPointContainer</span><span
style='font-family:宋体'>和</span><span lang=EN-US>IConnectionPoint</span><span
style='font-family:宋体'>。</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>客户可以从</span><span lang=EN-US>COM</span><span
style='font-family:宋体'>对象中得到它需要的信息，但</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>组件是在后台上。包装器处理</span><span lang=EN-US>IUnknown</span><span
style='font-family:宋体'>接口中的</span><span lang=EN-US>AddRef()</span><span
style='font-family:宋体'>、</span><span lang=EN-US>Release()</span><span
style='font-family:宋体'>、</span><span lang=EN-US>QueryInterface()</span><span
style='font-family:宋体'>方法。而在</span><span lang=EN-US>.NET</span><span
style='font-family:宋体'>对象中，可以依赖垃圾收集器，不需要处理引用数。</span></p>
<p class=a><span lang=EN-US><img width=468 height=222
src="28/image014.jpg"></span></p>
<p class=10><span style='font-family:宋体'>图</span><span lang=EN-US> 28-13</span></p>
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<h1 id="divCurrentNode2" style="color: #b83507; width: 100%; text-align: left; font-size: 12px; padding-left: 2px">当前章节:<a href='100165729.htm'><font color='red'>28.4.1 COM Callable Wrapper</font></a></h1>
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<div style='float:left;width:49%'>·<a href='100165726.htm'>28.3.5 在Windows窗体中使用ActiveX控件</a></div><div style='float:right;width:49%'>·<a href='100165727.htm'>28.3.6 在ASP.NET中使用COM对象</a></div><div style='float:left;width:49%'>·<a href='100165728.htm'>28.4 在COM客户程序中使用.NET组件</a></div><div style='float:right;width:49%'>·<a href='100165730.htm'>28.4.2 创建.NET组件</a></div><div style='float:left;width:49%'>·<a href='100165731.htm'>28.4.3 创建类型库</a></div><div style='float:right;width:49%'>·<a href='100165732.htm'>28.4.4 COM互操作特性</a></div></div>
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